I am including a "sub-project" into my project. To do that I simply copy and paste into my project. Say my project is com.important.stuff and the sub-project is com.redo.things.utensil.pencil. So I move the content of the sub-project so that the package would now be com.important.stuff.redo.things.utensil.pencil. But when I open my project in eclipse, it's all red and I know how to fix it one by one. But is there a batch solution?
My eclipse is Version: Juno Service Release 2
Import it in its original folder structure (as named in the package declaration of the original files) then when it compiles no complaints rename the package folder and it will rename the folders and change the package declaration in all files. (Good comment that refactor->rename is the canonical way to performs a rename where you want eclipse to search for all occurrences of the name and change it in a batch manner. It's worth spending time figuring out what everything on that menu does and the keyboard shortcut for rename so you can rename any variable when you realise a more descriptive name for it, or class, or method, or constant, ...)